期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 40, 页码 45235-45242出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c14398
关键词
2D perovskite; WS2; heterostructure; photovoltaic effect; self-driven photodetector
资金
- A-STAR 2D Pharos grant [SERC 1527000012]
- Singapore Ministry of Education [MOE2016-T2-2110]
- MOE [R-144-000-389-114]
- Singapore National Research Foundation
- Ministry of Education (MOE), Singapore, under AcRF Tier 3 [MOE2018-T3-1-005]
- A*STAR Pharos grant [1527000016]
- National Natural Science Foundation of China [11804286]
- Fundamental Research Funds for the Central Universities [19lgpy263]
- Special Program for Applied Research on Super Computation of the NSFC Guangdong Joint Fund
- graphene flagship core 3 programme
Two-dimensional (2D) Ruddlesden-Popper perovskites have been demonstrated to possess great potential for optical and optoelectronic devices. Because they exhibit better ambient stability than three-dimensional (3D) perovskites, they have been considered as potential substitutes for 3D perovskites as light absorbing layers to improve the photoresponsivity of monolayer transition metal dichalcogenide (TMDC)-based photodetectors. Investigation of the optoelectronic properties of TMDC monolayer/2D perovskite vertical heterostructures is however at an early stage. Here, we address the photovoltaic effect and the photodetection performance in tungsten disulfide (WS2) monolayer/2D perovskite (C6H5C2H4NH3)(2)PbI4 (PEPI) vertical heterostructures. A vertical device geometry with separate graphene contacts to both heterointerface constituents acted as a photovoltaic device and self-driven photodetector. The photovoltaic device exhibited an open circuit voltage of-0.57 V and a short circuit current of 41.6 nA. A photoresponsivity of 0.13 mA/W at the WS2/PEPI heterointerface was achieved, which was signified by a factor of 5 compared to that from the individual WS2 region. The current on/off ratio of the self-driven photodetector was approximately 1500. The photoresponsivity and external quantum efficiency of the self-driven photodetector were estimated to be 24.2 mu A/W and 5.7 x 10(5), respectively. This work corroborates that 2D perovskites are promising light absorbing layers in optoelectronic devices with a TMDC-based heterointerface.
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